SYSTEMA CONSTRUCTUM

Accepted ontology entry

noise-gate

Noise-gate is an audio processing device or algorithm that automatically attenuates or mutes an audio signal when its amplitude falls below a user-set threshold level, thereby reducing background noise between intentional sound events. Par…

ACCEPTED THINGee5c268a17a356e2048deb8b1

Definition

Noise-gate is an audio processing device or algorithm that automatically attenuates or mutes an audio signal when its amplitude falls below a user-set threshold level, thereby reducing background noise between intentional sound events. Parameters include threshold (the level at which the gate opens or closes), attack time (duration for the gate to fully open after signal exceeds threshold), hold time (minimum duration the gate remains open after signal drops below threshold), release time (duration for the gate to fully close after signal falls below threshold), and range (amount of attenuation applied when closed, from partial reduction to full mute). It persists as analog hardware (VCA-based gate circuits using voltage-controlled amplifiers) or digital software (real-time amplitude analysis with look-ahead processing). Used in recording, mixing, live sound, and broadcast to clean up microphone bleed, remove hum, and shape the decay of percussive instruments. Often combined with expanders (which provide gradual rather than binary attenuation). [formal: claustrum | substrate: matter | horizon: hours | explicit: yes | epoch: 0.01]

Why it is in scope

human-made audio signal processing device or algorithm that attenuates or mutes a signal when its level falls below a set threshold, used to reduce unwanted background noise between sound events

Names and aliases

Relations from this entry

  • audio-effectINSTANCE_OF →

    A noise-gate is an audio-effect that attenuates or mutes a signal when its level falls below a set threshold. Like distortion and equalizer, it is a specific kind of audio processing device/algorithm applied to an audio signal to modify its character — specifically by removing signals below threshold. A competent speaker would call it 'a kind of audio effect'.

  • envelope-followerDEPENDS_ON →

    Level detection: a noise-gate must track signal amplitude to decide when it opens or closes. The envelope follower is the operational mechanism for this — it produces the control signal tracking input level. Remove the envelope follower and the gate cannot detect signal level, so it stops operating. Law 8 removal test passes. Direction: noise-gate (dependent) → envelope-follower (mechanism).

  • cmrexhlpr0185g8vup2dwm91hDEPENDS_ON →

    A noise gate compares incoming signal level against a threshold to decide when to open or close the gate. Remove the threshold concept and the noise-gate mechanism has no operational reference — it cannot determine when to attenuate. Constitutive dependency confirmed.

  • cmsql7gfa001gnf0j5qt1ju3cSERVES →

    Law 8d for-whose-sake test: a noise gate is built FOR THE SAKE OF reducing unwanted noise — its own accepted definition states the purpose: 'reducing background noise between intentional sound events.' The servant points at the master: the gate is the means; noise-reduction (the accepted category carving attenuation of the noise component while preserving the desired signal) is the end it serves. Pinned sense: gate-as-serve-notice-of-the-noise-reduction-end. Not DEPENDS_ON (the gate operates without the category existing as an entry — a purpose is never a functional component, Law 8c) and not INSTANCE_OF (a simple gate does not meet the noise-reduction definition's statistical-estimation requirement — it attenuates below a threshold, it estimates nothing). Same shape as accepted technique-serves-application edges (mel-cepstral-distortion SERVES speech-recognition).

  • gainDEPENDS_ON →

    Noise-gate operates by attenuating (reducing) gain when signal level falls below threshold. Remove gain — the measure of amplification factor that the gate manipulates — and the gate ceases to operate: its core mechanism is gain reduction below threshold. Without gain as a parameter, the gate has no operational lever. Consistent with accepted precedent: compressor DEPENDS_ON gain, upward-expansion DEPENDS_ON gain, distortion DEPENDS_ON gain.

  • cmsrl309o01svkp53moyzjhswINSTANCE_OF →

    A noise gate is a specific kind of dynamic range compression technique: it reduces dynamic range by attenuating signals below a threshold. In audio engineering, gates are classified under the dynamic range processing family alongside compressors and expanders. A competent speaker would call a noise gate 'a form of dynamic range compression/control.'

  • audio-processingSERVES →

    SERVES: noise-gate is built for the sake of audio-processing — its designed purpose is to remove background noise from audio signals within audio-processing workflows, enabling cleaner audio processing outcomes.

Relations to this entry

No accepted relations in this direction.

Record identity

Created
Sep 7, 2026, 2:41 AM UTC
Content hash
44cab96cc14d7ad78890f0ee42938c56e50584a76d09b4af6c4c2c073ae59553

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